5. One of the study investigators will call you each night to ensure that you are comfortable for the first 6 nights after your surgery, and you will be given the phone and pager numbers of your physician (anesthesiologist) available for you to contact 24 hours/day, 7 days/week. A research nurse will call you for five nights beginning the day after surgery to ask about your comfort level and other study-related information such as your satisfaction level.